Effect of aging temperature on precipitation behavior and mechanical properties of extruded AZ80-Ag alloy

Yu, Sen; Gao, Yonghao; Liu, Chuming; Han, Xiaolin

doi:10.1016/j.jallcom.2015.06.126

Cited by 53 publications

(14 citation statements)

References 22 publications

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“…This further contributed to age hardening response of the samples. It has been established that nature of precipitation in AZ80 alloys at lower temperature (as in the present investigation) is predominantly discontinuous [23]. For Mg-alloys with high Al content, it has been shown that the transportation of solute atoms during discontinuous reactions is governed by grain boundary diffusion [24].…”

Section: Fig 4 Optical Micrographs From Az80 After Solution Treatmensupporting

confidence: 51%

Effect of Ultrasonication on the Solidification Microstructure in Al and Mg-Alloys

et al. 2019

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Section: Fig 4 Optical Micrographs From Az80 After Solution Treatmensupporting

confidence: 51%

Effect of Ultrasonication on the Solidification Microstructure in Al and Mg-Alloys

et al. 2019

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“…In general, a commonly accepted mechanism is that the precipitates nucleate at grain boundaries or vacancies, and grow up by the migration of reaction front, for which the driving force is the concentration difference of solute atoms between two sides of reaction front35. Additionally, the coarsening of precipitates could be induced by diffusional element transfer from small precipitates with high interfacial curvatures to large precipitates with low interfacial curvatures36.…”

Section: Resultsmentioning

confidence: 99%

Natural ageing responses of duplex structured Mg-Li based alloys

Wang

et al. 2017

Sci Rep

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Natural ageing responses of duplex structured Mg-6%Li and Mg-6%Li-6%Zn-1.2%Y alloys have been investigated. Microstructural analyses revealed that the precipitation and coarsening process of α-Mg particles could occur in β-Li phases of both two alloys during ageing process. Since a certain amount of Mg atoms in β-Li phases were consumed for the precipitation of abundant tiny MgLiZn particles, the size of α-Mg precipitates in Mg-6%Li-6%Zn-1.2%Y alloy was relatively smaller than that in Mg-6%Li alloy. Micro hardness measurements demonstrated that with the ageing time increasing, the α-Mg phases in Mg-6%Li alloy could have a constant hardness value of 41 HV, but the contained β-Li phases exhibited a slight age-softening response. Compared with the Mg-6%Li alloy, the age-softening response of β-Li phases in Mg-6%Li-6%Zn-1.2%Y alloy was much more profound. Meanwhile, a normal age-hardening response of α-Mg phases was maintained. Tensile results indicated that obvious ageing-softening phenomenon in terms of macro tensile strength occurred in both two alloys. Failure analysis demonstrated that for the Mg-6%Li alloy, cracks were preferentially initiated at α-Mg/β-Li interfaces. For the Mg-6%Li-6%Zn-1.2%Y alloy, cracks occurred at both α-Mg/β-Li interfaces and slip bands in α-Mg and β-Li phases.

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“…In this work, two typical heat treatment systems were specifically implemented: direct aging treatment (T5) and solution treatment + aging treatment (T6). Referring to previous studies [28,30], a representative solution temperature of 415 • C and aging temperature of 175 • C were selected. Several groups of solid solution treatment (T4) experiments showed that the single α-Mg microstructure was almost completely obtained after 1.5 h of solid solution (not shown in this paper), and thus the solution time was terminated at 1.5 h. The corresponding age-hardening curves of the extruded alloy via these two heat treatment schemes are exhibited in Figure 7.…”

Section: Effect Of Heat Treatment On Microstructurementioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of AZ80 Mg Alloy during Annular Channel Angular Extrusion Process and Heat Treatment

Zhao

Yan

et al. 2019

Materials

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Microstructure evolution and mechanical properties of AZ80 Mg alloy during annular channel angular extrusion (350 °C) and heat treatment with varying parameters were investigated, respectively. The results showed that dynamic recrystallization of Mg grains was developed and the dendritic eutectic β-Mg17Al12 phases formed during the solidification were broken into small β-phase particles after hot extrusion. Moreover, a weak texture with two dominant peaks formed owing to the significant grain refinement and the enhanced activation of pyramidal <c + a> slip at relative high temperature. The tension tests showed that both the yield strength and ultimate tensile strength of the extruded alloy were dramatically improved owing to the joint strengthening effect of fine grain and β-phase particles as compared with the homogenized sample. The solution treatment achieved the good plasticity of the alloy resulting from the dissolution of β-phases and the development of more equiaxed grains, while the direct-aging process led to poor alloy elongation as a result of residual eutectic β-phases. After solution and aging treatment, simultaneous bonding strength and plasticity of the alloy were achieved, as a consequence of dissolution of coarse eutectic β-phases and heterogeneous precipitation of a large quantity of newly formed β-phases with both the morphologies of continuous and discontinuous precipitates.

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Effect of aging temperature on precipitation behavior and mechanical properties of extruded AZ80-Ag alloy

Cited by 53 publications

References 22 publications

Effect of Ultrasonication on the Solidification Microstructure in Al and Mg-Alloys

Effect of Ultrasonication on the Solidification Microstructure in Al and Mg-Alloys

Natural ageing responses of duplex structured Mg-Li based alloys

Microstructure Evolution and Mechanical Properties of AZ80 Mg Alloy during Annular Channel Angular Extrusion Process and Heat Treatment

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